18/21V 5S Li-Ion Battery Protection Board 20A Module
18/21V 5S Li-Ion Battery Protection Board 20A Module
18/21V 5S Li-Ion Battery Protection Board — 20A Circuit Module
Keep your lithium battery packs running safely and efficiently with this compact 5S Li-Ion Battery Protection Board. Designed for 18V and 21V electric power tool battery packs, this 20A protection circuit module uses a dedicated 5-series lithium battery IC to provide real-time monitoring of voltage, charge/discharge current, and ambient temperature — all in a small 46×40 mm footprint.
Made in Mainland China.
Key Features
- Wide Current Support: Handles 8–20A charge/discharge current for demanding power tool applications.
- Comprehensive Protection Functions: Safeguards against overcharge, over-discharge, and short circuit conditions, with a 1-second overcharge protection delay.
- Real-Time IC Monitoring: Special-purpose 5S lithium battery IC continuously monitors each cell's voltage, current, and temperature.
- Ultra-Low Power Consumption: Working current of approximately 25µA; quiescent current as low as 6µA — minimal drain on your battery pack.
- Wide Operating Temperature Range: Rated from -55°C to 120°C (operating) and -55°C to 175°C (storage), with humidity tolerance up to RH ≤75%.
- DIY & Repair Friendly: Easy to integrate into custom or replacement battery pack builds for power tools and similar applications.
Specifications
| Compatible Battery Configuration | 5S Li-Ion (18V / 21V) |
| Charge Voltage | 25V |
| Current Range | 8–20A |
| Working Current | ~25µA at 25°C |
| Quiescent Current | ~6µA |
| Overcharge Protection Delay | 1 second |
| Board Dimensions | 46 × 40 mm |
| Operating Temperature | -55°C to 120°C, RH ≤75% |
| Storage Temperature | -55°C to 175°C, RH ≤75% |
| Package Contents | 1 × Protection Board Module |
Note: Product color and chip layout may vary between production batches, but performance and functionality remain unchanged.
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Frequently Asked Questions
Q: What battery configuration is this 5S protection board designed for?
A: This protection circuit board is specifically designed for 5-series (5S) Li-Ion battery packs, which operate at 18V to 21V. It is commonly used in electric power tool battery packs and similar DIY battery applications.
Q: What protection functions does this circuit board provide?
A: The board offers overcharge protection (with a 1-second delay), over-discharge protection, and short circuit protection. The built-in 5S IC monitors each cell's voltage, current, and temperature in real time to ensure stable, safe operation.
Q: Is this protection board suitable for DIY battery pack builds?
A: Yes! This module is ideal for DIY electrical projects and battery pack repairs. It is compact at 46×40 mm and supports 8–20A of current, making it a great fit for custom electric power tool battery packs. Always ensure you select the correct protection board for your specific battery configuration before installation.
Q: Will the board look exactly as pictured?
A: The board's color and chip layout may differ slightly between production batches, but these cosmetic differences do not affect the board's performance or functionality in any way.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.